Testing device for cored castings



March 29,1927. 1,622,602

G. A. MOHR TESTING DEVICE FOR CORED CASTINGS Filed Oct. 21, 1926 IN VENTOR.

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Patented Mar. 29, 1927.

UNITED STATES GEORGE A. MOHR, or DETROIT, MICHIGAN.

TESTING DEVICE FOR CORED CASTINGS.

Application filed October 21, 1926. Serial No. 143,030.

This invention aims to provide a testing device for cored castings bythe use of which it can be quickly ascertained if there is a projectingfin or any other partial or complete stoppage in any passage which ex'tends through a casting, for in many cases the passages are tortuous andit is impossible to make a visual inspection.

Another object of the invention is to provide a testing device which canbe quickly mounted on a cored casting so that the latter may be testedbefore it has been machined to any great extent, and in many casesbefore any machining whatever has been done thereon, so as to eliminatethe necessity of expending time and labor on castings which, whentested, may be found defective.

Ahfurther object of the invention is to provide a testing device inwhich compressed air may be employed, since the latter does not causethe cored walls and other parts of the casting with which it comes incontact to rust as is the case. when water is employed for this purpose.

I illustrate its application with the aid of the accompanying drawings,in which:

Figure 1 depicts a sectional elevation of the invention; I

Figure 2 is a side elevation showing one methodof attaching theinvention to a casting to be tested. 1

Figure 3 shows another view of the invention attached in another way toacasting the cored passages through which are also indicated.

Referring to the drawings, 1 designates a tubular member having apassage 2 extending longitudinally therein from its end 3 for the majorportion of its length. An opening 4:, smaller than and substantiallyconcentric with, the passage 2 extends from the opposite end 5 of themember to the said passage. A nozzle 6 is slidably mounted through theopening 4 so that its discharge end 7 may be set to project any desireddistance within the passage 2 for purposes hereinafter set forth. In theside of that portion of the tubular member through which the opening 42extends a radial tapped hole 8 is provided for a set screw 9, by whichlatter the nozzle may be held against accidental longitudinal movementthrough the opening 4.

On the outer end of the nozzle a valve 10 is usually provided, and intothe opposite end of the valve a length of pipell is secured. The pipe isin turn preferably connected by a flexible hose 12 to a source of airsupply.

Integral with the tubular member 1 is a I lateral connection 13 thecentre line of which inclined at less than ninety degrees to,

the nozzle 6 which doesnot usually extend past the said connection. Thelatter is usually threaded to receive the inner end of the cylinder 14on the outer end of which a cover 15 having a central opening 16therethrough is secured. An annular disc 17 is fixed, usually welded, inthe inner end of the cylinder and forms a stop for the downward annularflange 18 integral with the plunger 19, so that the under surface of thelatter cannot come directly in contact with the disc. Secured to theplunger is an outwardly extending indicating rod 20 which is of suchlength that it will, at all positions of the plunger, project throughthe opening 16 in the cap 15. In order to protect the indicating rodfrom becoming bent or damaged a shield 21, sometimes integral with thecap 15, is mounted on the latter.

In Figure 2 it will be seen that the end 3 of the tubular member 1,which is threaded externally, has a coupling 22 thereon, the oppositeend of which latter is screwed onto a casting 23 so that the coredpassage 2&- in the latter'registers with the passage 2 of the device.

In Figure 3 a connection 22 is shown in threaded engagement with the end3 of the tubular member 1. This connection has forwardly and inwardlyextending lugs 22 through which set screws 22 are arranged so as toforce the flange 23 of the casting 23 against the outer face of the saidconnection. In this case I usually insert a resilient Washer 25 betweenthe connection 22 and the flange 23 so as to insure a tight joint. Whenthe device is mounted in position care should be taken to see that thepassage 3 registers with the cored passage 24 The operation of thedevice is as'follows: Compressed air passes through the nozzle 6 intothe passage 2 and induces suction through the latter connection 13thereby Ill) wards. hen once the amount of air How has been set, andthe'end 7 of the nozz'le 6 moved longitudinally so that the suction willdraw the plunger towards the disc 17, it will be found that the rod willbe drawn inwards substantially a similar amount for all castings madefrom a similar pattern. But if there is a fin, such as the one indicatedat 24-", in the cored passage 24L a disturbed air condition will resultso that the rod will move rapidly in and out, or it the cored passage ispartly obstructedby an inward projection as shown at 24 the air flowwill be retarded, with the result that the rod will not be drawn inwardsas faras usual, and also if the projection is irregular enough to causean air'disturbance the rod will also move in and out.

Obviously the nozzle 6' must be differently set for diflerent' ca'stingsas there is a greater resistance to the air flow in cast i'ngs' havinglbnge'r and more tortuous passages. I

From the foregoing description it is believed that the construction andoperation of the device will be readily understood. Moreover whereas apreferred construction of the invention has been described and shown itis understood that modifications may be made thereto provided they fallwithin the scope of the appended claims.

W hat I claim as-my invention and desire to secure by Letters Patent is:

1. In a testing device for cored castings, the combination of a tubularmember haV- ing alongitudinal passage'therein, a nozzle extending intosaid passage substantially in line with the latter, alateralinclined'branch opening into said passage, a plunger in saidbranch, and an indicating means connected to said plunger adapted tofui'iction when fluid under pressure passes successively through saidnozzle and passage.

2. In a testing device for cored castings, the combination of a tubularmember having'a' longitudinal passage therethrou'gh of reduced diameterat one end, a nozzle extending through said passage portion of reduceddiameter, a lateral branch opening into said passage, a plunger in saidbranch, and an indicating rod connected' to said plunger.

3. In a testing device for cored castings, the combination of a' tubularmember having a longitudinal passagetherethrough or reduced diameter atone end, a nozzle slidable in" said passage portion of reduced diameterand extending therethrough, means for holding said nozzlein' apredetermined position in said reduced passage portion, an inclinedlateral branch opening in said passage, aplunger in said branch, and anoutwardly projecting indicating rod on said lungeradaptedr tomove whenfluid under pressure passes successively through said nozzle and assage:

d. In a testing device for cored castings, the coiiibhiation oi atubular member having a longitudinal passage therein, nozzle extendinginto said passage substantially in line witli'the lhtter, a lateralinclined branch opening'int'o said" passage, an outwardly projectingcylinder mounted in said branch having its lower end in"communicationwith the latter, a plunger in said cylinder, and anindicating rod extending outwardly from said plunger.

5. In a testing device for cored castings the combination of a tubularmember hav- .ing a longitudinal passage extending from one end, a nozzleextending into said passage substantiallyin line with the latter, aninclined lateral branch opening into said passage, a plunger in saidbranch; an indicating rod projecting outwardly from said plunger, saidtubular member being adapted to be secured to a casting having a holetherethrough so that said passage registers Wlllll sa d hole, and saidplunger be ng adapted to be drawn inwards when fluid under pressurepasses successively through said nozzle, said passage, and said hole.

6. In a testingdevice for cored castings, the combination of a' tubularmember having a longitudinal passage therethrough or reduced diameter atone end, a nozzle extending through said passage portion of reduceddiameter, an inclined lateral branch opening into said passage, a.cylinder extending oiitwardly from said branch, said cylinder havingitsunderside in communication with said branch, a plunger in said cylinder,an indicatin rod on said'plunger, said plunger being'adapted to be drawninwards in said cylinder by suction when fluid under pressure passesthrough said nozzle and said passage, means for regulating theamount'oi' suction exerted on said plunger, and said tubular memberbeing adapted to be secured toa casting having a hole there through sothat said" passage registers with said hole.

GEORGE A. MOHl-t.

